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                        第18章：事件冒泡与事件代理
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<td>querySelectorAll()</td>
<td style="text-align:center">&#x83B7;&#x53D6;&#x9759;&#x6001;&#x7684;NodeList&#x5217;&#x8868;</td>
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<p>html&#x4EE3;&#x7801;</p>
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    &lt;ul&gt;
        &lt;li&gt;01
            &lt;ul&gt;
                &lt;li&gt;01-01&lt;/li&gt;
            &lt;/ul&gt;
        &lt;/li&gt;
        &lt;li&gt;02&lt;/li&gt;
        &lt;li&gt;03&lt;/li&gt;
        &lt;li&gt;04&lt;/li&gt;
        &lt;li&gt;05&lt;/li&gt;
    &lt;/ul&gt;
</code></pre><p>js&#x4EE3;&#x7801;</p>
<pre><code>    /*document.getElementById()
    document.getElementsByClassName()
    document.getElementsByTagName()
    document.getElementsByName()*/

    var ul = document.getElementsByTagName(&quot;ul&quot;)[0];
    // &#x7C7B;&#x6570;&#x7EC4;&#xFF0C;lenght&#x5C5E;&#x6027;&#x53CD;&#x6620;&#x51FA;&#x67E5;&#x8BE2;&#x9875;&#x9762;&#x7ED3;&#x6784;&#x7684;&#x4E2A;&#x6570;
    console.log( ul,ul.length )


    // document.querySelector()            &#x652F;&#x6301;css3&#x9009;&#x62E9;&#x5668;
    // document.querySelectorAll()        &#x83B7;&#x53D6;&#x9759;&#x6001;&#x7684;NodeList&#x5217;&#x8868;

    // &#x83B7;&#x53D6;&#x5B50;&#x8282;&#x70B9;
    // childNodes &#x5305;&#x542B;&#x6587;&#x672C;&#x8282;&#x70B9;&#x548C;&#x5143;&#x7D20;&#x8282;&#x70B9;    &#xFF08;&#x6807;&#x7B7E;&#xFF09;
    // childElementCount    &#x5143;&#x7D20;&#x8282;&#x70B9;&#x7684;&#x4E2A;&#x6570;
    // children    &#x6240;&#x6709;&#x7684;&#x5B50;&#x5143;&#x7D20;&#x8282;&#x70B9;
    console.log( ul.childNodes , ul.childElementCount , ul.children )

    // &#x7B2C;&#x4E00;&#x4E2A;&#x5B50;&#x5143;&#x7D20; &#x548C; &#x6700;&#x540E;&#x4E00;&#x4E2A;&#x5B50;&#x5143;&#x7D20;
    // &#x5E26; Element &#x5B57;&#x773C;&#x7684;&#x4F1A;&#x8FD4;&#x56DE;&#x5143;&#x7D20;&#x8282;&#x70B9;
    console.log( ul.firstChild , ul.firstElementChild )
    console.log( ul.lastChild , ul.lastElementChild )

    // &#x4E0A;&#x4E00;&#x4E2A;&#x8282;&#x70B9; &#x548C; &#x4E0B;&#x4E00;&#x4E2A;&#x8282;&#x70B9;
    // &#x5982;&#x679C;&#x5230;&#x4E86;&#x5C3D;&#x5934;&#x8868;&#x793A;&#x6CA1;&#x6709;&#x4E0B;&#x4E00;&#x4E2A;&#x6216;&#x4E0A;&#x4E00;&#x4E2A;&#xFF0C;&#x90A3;&#x4E48;&#x5C31;&#x4F1A;&#x8FD4;&#x56DE;null
    var li = document.getElementsByTagName(&quot;li&quot;);
    console.log( li[2].nextSibling , li[2].nextElementSibling.previousElementSibling )
    console.log( li[2].previousSibling , li[2].previousElementSibling )

    // &#x7236;&#x8282;&#x70B9;
    console.log( li[2].parentNode , li[2].parentElement )
    console.log( li[2].parentNode.id = &quot;li02&quot; )
</code></pre><h3 id="2dom&#x5220;&#x9664;">2.DOM&#x5220;&#x9664;</h3>
<table>
<thead>
<tr>
<th>&#x65B9;&#x6CD5;&#x540D;</th>
<th style="text-align:center">&#x4F5C;&#x7528;</th>
</tr>
</thead>
<tbody>
<tr>
<td>removeChild()</td>
<td style="text-align:center">&#x5220;&#x9664;&#x5B50;&#x8282;&#x70B9;</td>
</tr>
<tr>
<td>remove()</td>
<td style="text-align:center">&#x5220;&#x9664;&#x81EA;&#x8EAB;</td>
</tr>
</tbody>
</table>
<p>html&#x4EE3;&#x7801;&#xFF1A;</p>
<pre><code>
    &lt;ul&gt;
        &lt;li&gt;01&lt;/li&gt;
        &lt;li&gt;02&lt;/li&gt;
        &lt;li&gt;03&lt;/li&gt;
        &lt;li&gt;04&lt;/li&gt;
        &lt;li&gt;05&lt;/li&gt;
    &lt;/ul&gt;

    &lt;ul&gt;
        &lt;li&gt;&lt;span&gt;1&lt;/span&gt;&lt;button onclick=&quot;del(this)&quot;&gt;del&lt;/button&gt;&lt;/li&gt;
        &lt;li&gt;&lt;span&gt;2&lt;/span&gt;&lt;button onclick=&quot;del(this)&quot;&gt;del&lt;/button&gt;&lt;/li&gt;
        &lt;li&gt;&lt;span&gt;3&lt;/span&gt;&lt;button onclick=&quot;del(this)&quot;&gt;del&lt;/button&gt;&lt;/li&gt;
        &lt;li&gt;&lt;span&gt;4&lt;/span&gt;&lt;button onclick=&quot;del(this)&quot;&gt;del&lt;/button&gt;&lt;/li&gt;
        &lt;li&gt;&lt;span&gt;5&lt;/span&gt;&lt;button onclick=&quot;del(this)&quot;&gt;del&lt;/button&gt;&lt;/li&gt;
    &lt;/ul&gt;

    &lt;input type=&quot;&quot; name=&quot;username&quot; id=&quot;&quot; value=&quot;Yhumi&quot; /&gt;
</code></pre><p>js&#x4EE3;&#x7801;&#xFF1A;</p>
<pre><code>
    var ul = document.getElementsByTagName(&quot;ul&quot;)[0];
    // &#x5220;&#x9664;&#x5B50;&#x8282;&#x70B9;
    //ul.removeChild(ul.firstElementChild);

    // &#x5220;&#x9664;&#x81EA;&#x8EAB;
    //ul.remove();

    // DOM &#x4E2D;&#x7684;onclick&#x5C5E;&#x6027;&#x8868;&#x793A;&#x70B9;&#x51FB;&#x65F6;&#x6267;&#x884C;&#x64CD;&#x4F5C;

    // DOM &#x4E2D;&#x7684;this&#x6307;&#x7684;&#x662F;&#x89E6;&#x53D1;&#x4E8B;&#x4EF6;&#x7684;&#x5BF9;&#x8C61;&#xFF08;&#x5143;&#x7D20;&#xFF09;

    function del(el){
        console.log(el)
        el.parentElement.remove();
    }

    var input = document.getElementsByName(&quot;username&quot;)[0];
    var input_val =  input.value;
    console.log( input.value )
</code></pre><h3 id="3dom&#x6DFB;&#x52A0;">3.DOM&#x6DFB;&#x52A0;</h3>
<table>
<thead>
<tr>
<th>&#x65B9;&#x6CD5;&#x540D;</th>
<th style="text-align:center">&#x4F5C;&#x7528;</th>
</tr>
</thead>
<tbody>
<tr>
<td>appendChild()</td>
<td style="text-align:center">&#x961F;&#x5C3E;&#x63D2;&#x5165;&#x65B0;&#x7684;&#x8282;&#x70B9;</td>
</tr>
<tr>
<td>insertBefore()</td>
<td style="text-align:center">&#x6307;&#x5B9A;&#x4F4D;&#x7F6E;&#x63D2;&#x5165;insertBefore(&#x65B0;&#x8282;&#x70B9;&#xFF0C;&#x63D2;&#x5165;&#x5230;&#x67D0;&#x4E2A;&#x5143;&#x7D20;&#x4E4B;&#x524D;),&#x5982;&#x679C;&#x7B2C;&#x4E8C;&#x4E2A;&#x53C2;&#x6570;&#x4E3A;null&#x5219;&#x63D2;&#x5165;&#x961F;&#x5C3E;,&#x82E5;&#x63D2;&#x5165;&#x5143;&#x7D20;&#x5DF2;&#x5B58;&#x5728;&#x7236;&#x8282;&#x70B9;&#x4E2D;&#xFF0C;&#x90A3;&#x4E48;insertBefore&#x4F1A;&#x66F4;&#x65B0;&#x5143;&#x7D20;&#x7684;&#x4F4D;&#x7F6E;&#xFF08;&#x5220;&#x9664;&#x91CD;&#x65B0;&#x6DFB;&#x52A0;&#xFF09;</td>
</tr>
<tr>
<td>cloneNode()</td>
<td style="text-align:center">cloneNode( &#x5E03;&#x5C14;&#x503C; ) &#x9ED8;&#x8BA4;false&#x6D45;&#x62F7;&#x8D1D;&#xFF0C;true&#x4E3A;&#x6DF1;&#x62F7;&#x8D1D;(&#x8FDE;&#x540C;&#x5B50;&#x5143;&#x7D20;&#x7684;&#x7ED3;&#x6784;&#x90FD;&#x8FDB;&#x884C;&#x62F7;&#x8D1D;)</td>
</tr>
<tr>
<td>innerText</td>
<td style="text-align:center">&#x66F4;&#x6539;&#x5143;&#x7D20;&#x5185;&#x7684;&#x6587;&#x672C;</td>
</tr>
<tr>
<td>innerHTML</td>
<td style="text-align:center">&#x5982;&#x679C;&#x5B57;&#x7B26;&#x4E32;&#x5185;&#x5305;&#x542B;html&#x4EE3;&#x7801;&#xFF0C;&#x4F1A;&#x5C06;&#x4EE3;&#x7801;&#x90E8;&#x5206;&#x89E3;&#x6790;&#x5E76;&#x8F93;&#x51FA;html&#x7ED3;&#x6784;</td>
</tr>
<tr>
<td>outerHTML</td>
<td style="text-align:center">outerHTML &#x548C; innerHTML &#x5BF9;&#x6BD4;&#xFF0C;&#x4F5C;&#x7528;&#x5728;&#x5143;&#x7D20;&#x7684;&#x672C;&#x8EAB;</td>
</tr>
</tbody>
</table>
<p>html&#x4EE3;&#x7801;&#xFF1A;</p>
<pre><code>    &lt;ul&gt;
        &lt;li&gt;01&lt;/li&gt;
        &lt;li&gt;02&lt;/li&gt;
        &lt;li&gt;03&lt;/li&gt;
        &lt;li&gt;04&lt;/li&gt;
        &lt;li&gt;05&lt;/li&gt;
    &lt;/ul&gt;
</code></pre><p>js&#x4EE3;&#x7801;&#xFF1A;</p>
<pre><code>    var ul = document.getElementsByTagName(&quot;ul&quot;)[0];
    // &#x521B;&#x5EFA;li
    var newLi = document.createElement(&quot;li&quot;);


    /*****************************
        &#x63D2;&#x5165;&#x8282;&#x70B9;
    *****************************/ 

    // &#x961F;&#x5C3E;&#x63D2;&#x5165;
    ul.appendChild(newLi);

    // &#x6307;&#x5B9A;&#x4F4D;&#x7F6E;&#x63D2;&#x5165;    insertBefore(&#x65B0;&#x8282;&#x70B9;&#xFF0C;&#x63D2;&#x5165;&#x5230;&#x67D0;&#x4E2A;&#x5143;&#x7D20;&#x4E4B;&#x524D;)
    // &#x5982;&#x679C;&#x7B2C;&#x4E8C;&#x4E2A;&#x53C2;&#x6570;&#x4E3A;null&#x5219;&#x63D2;&#x5165;&#x961F;&#x5C3E;
    // &#x82E5;&#x63D2;&#x5165;&#x5143;&#x7D20;&#x5DF2;&#x5B58;&#x5728;&#x7236;&#x8282;&#x70B9;&#x4E2D;&#xFF0C;&#x90A3;&#x4E48;insertBefore&#x4F1A;&#x66F4;&#x65B0;&#x5143;&#x7D20;&#x7684;&#x4F4D;&#x7F6E;&#xFF08;&#x5220;&#x9664;&#x91CD;&#x65B0;&#x6DFB;&#x52A0;&#xFF09;
    ul.insertBefore(newLi,ul.children[2]);



    /*****************************
        &#x514B;&#x9686;&#x8282;&#x70B9;
    *****************************/ 

    // cloneNode( &#x5E03;&#x5C14;&#x503C; ) &#x9ED8;&#x8BA4;false&#x6D45;&#x62F7;&#x8D1D;&#xFF0C;true&#x4E3A;&#x6DF1;&#x62F7;&#x8D1D;(&#x8FDE;&#x540C;&#x5B50;&#x5143;&#x7D20;&#x7684;&#x7ED3;&#x6784;&#x90FD;&#x8FDB;&#x884C;&#x62F7;&#x8D1D;)
    var newUl =  ul.cloneNode( true );
    document.body.appendChild(newUl);


    /*****************************
        &#x6DFB;&#x52A0;&#x5185;&#x5BB9;
    *****************************/ 

    // innerText &#x66F4;&#x6539;&#x5143;&#x7D20;&#x5185;&#x7684;&#x6587;&#x672C;
    // innerHTML &#x5982;&#x679C;&#x5B57;&#x7B26;&#x4E32;&#x5185;&#x5305;&#x542B;html&#x4EE3;&#x7801;&#xFF0C;&#x4F1A;&#x5C06;&#x4EE3;&#x7801;&#x90E8;&#x5206;&#x89E3;&#x6790;&#x5E76;&#x8F93;&#x51FA;html&#x7ED3;&#x6784;
    newLi.innerText = &quot;&#x8FD9;&#x662F;&#x65B0;&#x52A0;&#x7684;li&#x6807;&#x7B7E;&quot;;
    newLi.innerHTML = &quot;&lt;h1&gt;&#x8FD9;&#x662F;&#x65B0;&#x52A0;&#x7684;li&#x6807;&#x7B7E;&lt;/h1&gt;&quot;;
    //newLi.innerHTML = &quot;&lt;script&gt; alert(&apos;666&apos;); &lt;\/script&gt;&quot;;

    // outerHTML &#x548C; innerHTML &#x5BF9;&#x6BD4;&#xFF0C;&#x4F5C;&#x7528;&#x5728;&#x5143;&#x7D20;&#x7684;&#x672C;&#x8EAB;
    newLi.outerHTML = &quot;&lt;h1&gt;text&lt;/h1&gt;&quot;
</code></pre>
                    
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